Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-04-11
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 1 postscript figure, submitted to Phys.Rev.Lett
Scientific paper
We present the results of a search for $B^{+}\to\gamma \ell^{+}\nu_{\ell}$, where $\ell = e, \mu$. We use a sample of 232 million $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ with the BaBar detector at the PEP-II $B$ Factory. We measure a partial branching fraction $\Delta\mathcal{B}$ in a restricted region of phase space that reduces the effect of theoretical uncertainties, requiring the lepton energy to be between 1.875 and 2.850GeV, the photon energy to be between 0.45 and 2.35GeV, and the cosine of the angle between the lepton and photon momenta to be less than -0.36, with all quantities computed in the $\Upsilon(4S)$ center-of-mass frame. We find $\Delta\mathcal{B}(B^{+}\to\gamma \ell^{+}\nu_{\ell}) = (-0.3^{+1.3}_{-1.5} ({stat}) \pm 0.6 ({syst}) \pm 0.1 ({th})) \times 10^{-6}$, assuming lepton universality. Interpreted as a 90% C.L. Bayesian upper limit, the result corresponds to $1.7\times10^{-6}$ for a prior flat in amplitude, and $2.3\times10^{-6}$ for a prior flat in branching fraction.
"The BABAR Collaboration
Aubert B.
No associations
LandOfFree
Search for the radiative leptonic decay B+ --> gamma l+ nu does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Search for the radiative leptonic decay B+ --> gamma l+ nu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Search for the radiative leptonic decay B+ --> gamma l+ nu will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-673574